nogoodvsnotgood
Thephrases"notgood"and"nogood"mayseemsimilar,butthereisa subtledifferenceinmeaningbetweenthem.
"Notgood"istypicallyusedtoexpressanegativeevaluationof something'squalityorperformance.Itindicatesthatsomethingis unsatisfactoryorbelowaverage.Forexample,"Thefoodatthe restaurantwasnotgood"meansthatthefoodwasofpoorqualityor didn'ttastegood.
"Nogood",ontheotherhand,istypicallyusedtoindicatethat somethingiscompletelyuselessorofnovalue.Itsuggeststhat somethingisnotadequateforthepurposeitwasintendedfor.For example,"Thisoldcomputerisnogoodforrunningmodernsoftware" meansthatthecomputerisnotcapableofrunningmodernsoftware.
Insummary,"notgood"suggeststhatsomethingfallsshortofacertain standardorexpectation,while"nogood"suggeststhatsomethingis completelyinadequateoruselessforaparticularpurpose.
nogood(noun):useless/bad (notadequatefortheintendedpurpose)
notgood(adjective):lowquality (fallsshortofacertainstandardorexpectation)